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Federally lic Gun Dealer
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Discussion Starter · #1 · (Edited)
O.k. - here is what you have been waiting for; the write up on the UTV upgrades
for my 660 Grizzly.

Let me start off by thanking John (owner) of UTV because w/o his suggestions and cooperation this would not have gotten off the ground, so - Thank you John / UTV CRAP!

Now - many of you know that I already have a machined sheave from another vendor, shim mod and Dayco belt set-up in the Grizz so when I give my opinions below, please be aware that I'm not comparing the UTV set-up to a stock CVT, I'm comparing it to the modified one I already had - o.k.?

Here is what I received today:
Machined 660 sheave
Set of 8 16 gram greasless roller weights (see note at bottom of post)
Set of 4 greasless cam sliders
1mm stainless shim
New Yamaha Cam plate
EPI (Orange) secondary spring
New Yamaha belt

As you will see in the photos below, the UTV sheave is machined in the roller ramps in both the inner and outer section of the ramp.
The greaslees weights appear to be well made and only time will tell on the wear factor (John says I sould get what the OEM Yamaha weights get in time vs wear factors) - we'll see as time goes on.
I elected to go with a new cam plate just beacuse I can keep my original one with the sheave/roller asy I'm taking out - This will make it easier to ship if I sell it down the road.
The cam plate sliders are made of some special plastic (seems to be the same as the outer shell of the rollers) and this is to allow them to slide in/out with the cam plate and not wear prematurely.

Installation was basicly the same as any other sheave overhaul; I removed the greased sheave asy and set it aside on the bench. Then I removed the secondary sheave asy and laid that face down on the garage floor and used a 1-13/16 socket and my impact gun to loosen the nut on the back of the spring retainer. I then used the supplied spring compressor tool to remove the original spring and replace with the orange spring and retorqued back to 66 ft lbs.
(Note: while I had the spring off - I was able to spread the sheave halves apart and scuff with my die grinder and a scotch brite scuff pad - I believe this helps prevent belt slippage).

I then scuffed both halves of the primary sheave and wiped all components with brake clean to remove any greease residue before reassembly.
I placed the 8 weights into the sheave, installed the new sliders onto the new cam plate and assembled the sheave as nornal EXCEPT I was able to leave off the sheave cap, o-ring and hardware because w/o grease - you don't need the cap. This may be splitting hairs, but it's less unsprung weight for the engine to try to turn, so in effect the rpms would come up a bit faster - JMO.
Installed the secondary sheave into the bike first and torqued the lock nut down to 75 ft lbs, then I installed the 1mm shim and primary sheave asy and torqued that lock nut down to 90 ft lbs., installed the primary sheave cage which houses the outer support bearing and fired her uo to inspect for any issues - there were none. Buttoned the side cover up, installed the foot well asy and took her for a little test ride.

Results:
I'm impressed!
I was only able to ride up/down the street (tomorrow will be the true test when we ride at Butch's house) but I could feel a little more grab on the bottom - this would be atributed to the secondary spring; and I think I got a little more top end, but it was hard to judge in the street. I do feel I got a more snappy mid range and the CVT deffinetly grabed well when needed, so al in all - I'd say it looks very promising. Tomorrow will tell........
For you guys that are considering going from stock to a machined sheave, the UTV sheave is as good (if not better) than the Hi-tech or any other machined sheave around AND if your going to change the sheave - GREASLESS is the way to go! The orange secondary spring deffinetly helps lock up the belt (compared to stock spring) but you will need the proper tools to do that job (1-13/16 or 46mm socket, impact gun and secondary spring compressor, so be prepared)

Here are some photos of the components:

UVT Greasless sheave:


Machined outside area:


Machined inside area:


Greasless rollers (14 gram):


Rollers in the sheave - no grease:


Greasless sliders for the cam plate:


Scuffed sheave sections:


Secondary spring installed:


Complete set-up installed:
(note no cap on the primary)


I would like to add the following note:

I have editied my posts on the UTV Crap greaslees weights to read 16 gram weights
because due to a lack of communication between UTV and myself I was under the
impression that they sent me 14 gram weights, but in effect they consider the greaslees
weights 14 gram + 2 gram cover - so you wind up with 16 gram total weight per roller.

Anyone who is considering purchasing weights from UTV will need to be specific as to weather
or not you are buyin replacement (greasable) weights or Greasless weights, as the greasable
weights are made to use your existing OEM roller covers so this effects the total weigh of said
roller - confused? I was - that's why I put this note into my posts.

Any questions - contact me via PM and we can discuss................
 

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"Diz"
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1,731 Posts
Great write-up, Jack...as always! thanks. Knardly wait for the full test-ride review.

Could you add in a shot of the spring compressor? I am curious as to how it operates.
 

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88 Posts
Those rollers look pretty interesting. Looking forward to seeing it all in action.......See you in the morning.:BBQ:

Oh Yeah....Great write up, thank's for putting it all out there.
 

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CTD Out!
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7,584 Posts
Nice write up Jack, so in your opinion is a cam plate needed or only if I want to sell my OEM assembly? Also from the pics it looks like all the machine work is on the inside of the sheaves. Did you install a shim also?
 

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Federally lic Gun Dealer
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4,590 Posts
Discussion Starter · #6 ·
Nice write up Jack, so in your opinion is a cam plate needed or only if I want to sell my OEM assembly? Also from the pics it looks like all the machine work is on the inside of the sheaves. Did you install a shim also?
The cam plate itself is bone stock, so if you wanted to - you can reuse you old one, but you will have to replace the sliders & clips (little metal U clips inside the sliders) if your going with all Greasless set-up.

UTV only machines the inside of the sheave (basket section) - they do not machine the surface that contacts the belt.

Yes - I edited the original post to atate that I used the 1mm shim
 

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31 Posts
Very nice write up Jack, and all the part's look great!!!
Doe's the machining on the bottom of the ramps add more bottom end? (slightly confused on that).
And you said that you added a 1mm shim, so with this set up how much shim can you add total?
Can you go more than 1mm?
 

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Premium Member
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2,686 Posts
I think You can add up to 2 mm til You start rub the cage but from what I see -when You greaseless You don't need the cap, so also You might go with more shimming- I guess.I know somebody even went with 2.2 mm. I end up with 1.5 mm.
 

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Federally lic Gun Dealer
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Discussion Starter · #9 ·
Very nice write up Jack, and all the part's look great!!!
Doe's the machining on the bottom of the ramps add more bottom end? (slightly confused on that).
And you said that you added a 1mm shim, so with this set up how much shim can you add total?
Can you go more than 1mm?
I believe that the inner machining is designed to add a bit more bottom by allowing the
rollers to seat lower in the ramp at low rpm's - buit I have to ask John about this because I wasn't aware of this untill I received the sheave.

I went with the 1mm shim (Shim Mod) because John had stated that if you go too much more and the belt could actually slip a bit due to the bottom opening of the sheave being too wide to grip the belt well. As instructed - I checked for clearence and as long as the belt insn't touching the machined roller the sheave rides on I'm o.k.

I have heard of guys going as much as 3mm but this hardly seems possible because at 2mm you run out of spline on the shaft and you can't torque down the lock nut if the cam plate isn't lined up properly with the splines.
So to answer your question - you can go up to a 2mm shim mod on almost any sheave asy, but I believe the inner machine work on the UTV sheave is in effect acting as 1mm, so I only need a 1mm shim.
Is that clear or did I make that sound confusing?
 

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PORN STARR
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1,159 Posts
The evel one

Man I'm digging it. Now if it rips the front end off the ground at will and hits 70mph or even 69 they..uhhh...yeah I said 69,,,well if the speed and bottom are there it looks like the purrrfect set-up...I really like the no grease part too. The less parts to get the job done the better....I'm just sayin"thedevil1thedevil1thedevil1
 

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Federally lic Gun Dealer
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Discussion Starter · #12 ·
well Terry - the front end comes right up but we'll see about top end
on yhe test ride later today.
I will report back later on in the weekend...........
 

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Federally lic Gun Dealer
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Discussion Starter · #14 ·
Trail Report:
O.K. - well yesterday I went on a ride with Butch, Rick (Gamedog), Nick (Grizzrider08), Dave (Jeep98), Dan (NJ09Grizz) and one of Butch's friends - Honda Rich on some of the nastiest rocks I have ever rode on.
There was a bit of a learning curve for me because the cvt grabbed much quicker than my old set-up and I hand to get used to that; but once I got my thumb to calm doen a bit it was very noticable as to how the belt was locking up and the power was right there all day long.
I never had a chance to really open it up for top end but we did have a strech where I got her up to 52mph and I had more to go, so I would say that I believe this set-up has increased the top end as well as improved the bottom end. I'll repost to this thread next time I'm out and can do a top end speed run.

Summary:
I'm VERY PLEASED with hte performance of the UTV Crap sheave set-up.
Bottom end - greatly improved
Top end - no noticeable loss and I believe there may be a bit of a gain
Servicability - Going greasless is nice because if I want to experiment with weights I can do a weight swap
in about 45 min. without even getting dirty.
Performance - Maybe I'm crazy, but I really believe the throttle was a slight bit snappier and I think it's
because without the grease, end cap, the hardware, ect. - there is a bit les unspring
weight on the crank and this reflects in the performance
Noise - I did find that I had a slight bit more noise from the cvt, and I attribute that to the lack of the
grease and end cap. The noise really isn't an issue, but I thought I'd mention it anyway.

I'll report back time to time and let you all know how the wear and tear is going but for now I would say the UTV Crap Greasless Sheave / Weight set-up is a good deal, it works and I'm happy (and I'm a Cynic so Usally I find fault with almost everything - not here though)- Good Job John at UTV!
 

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Federally lic Gun Dealer
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Discussion Starter · #15 ·
If anyone is interested in a UTV set-up, feel free to contact me and I'll explain the process
and how / what to speak to John about.
 

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Thanks Jack Glad everything worked well for ya ... wish you could have done a hi speed run you will see a increase of 6-10 mph with our sheave ...

we are going to try to get some complete kits up on our site so you guys can buy the whole package ....
 

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Federally lic Gun Dealer
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Discussion Starter · #17 ·
Trail Report addendum:

O.K. - At SSRT ride this weekend, I got the ole girl up to 68 mph on the speedo with a bit more top end
left in 'er, but I ren out of room!

I can say that I definetly got more top end speed with John's sheave set-up. I am guessing approx. 8 mph; which is right where John said I should be (6-10 mph) - so maybe with more room I could have got that other 2 mph but it really doesn't matter - it work and that's all I care about.

Thank You John / UTV Crap!
JT
 

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PORN STARR
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The evel one

Man that's good news...plenty of power bottom and top and with larger than stock tires you're speedo has to be a bit slow....I'll be adding some AP Skids in the near future and will have to get the UTV Crap set up as well. Excellent write up as usual and thanks for working all that out Jack...thedevil1thedevil1thedevil1
 

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68 that's pretty good... i'm impressed concidering your oversized tire's, the lite 14g weights and a shim.
wonder what it would of done with the stock weights?

Jack - did you check you low range speed to see were you hit the limiter?
 

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Federally lic Gun Dealer
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Discussion Starter · #20 ·
No I didn't check the low range / limiter because last time I ran it in low
at top speed I smoked a belt.

Note: I smoked the belt in low with another set-up NOT the UTV Crap
set-up but I don't want to chance it - my bike is powerful for a 660.........
 
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